EP2001218B1 - Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser - Google Patents

Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser Download PDF

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Publication number
EP2001218B1
EP2001218B1 EP07011124A EP07011124A EP2001218B1 EP 2001218 B1 EP2001218 B1 EP 2001218B1 EP 07011124 A EP07011124 A EP 07011124A EP 07011124 A EP07011124 A EP 07011124A EP 2001218 B1 EP2001218 B1 EP 2001218B1
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EP
European Patent Office
Prior art keywords
raster
laser light
halftone dot
halftone
printing plate
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP07011124A
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German (de)
English (en)
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EP2001218A1 (fr
Inventor
Ernst-Rudolf Dr. Weidlich
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to DE502007005952T priority Critical patent/DE502007005952D1/de
Priority to AT07011124T priority patent/ATE492117T1/de
Priority to EP07011124A priority patent/EP2001218B1/fr
Publication of EP2001218A1 publication Critical patent/EP2001218A1/fr
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Revoked legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4058—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern with details for producing a halftone screen at an oblique angle

Definitions

  • the invention relates to a method for engraving a printing form, in particular for engraving a printing form for gravure printing.
  • a method for engraving a printing form is known from US-A-4,131,782 known.
  • the formation of wells receiving ink and dispensing ink for example, in the rotation of a printing roller at an imaging, deviating from the imaging in one of the normal screw movement at performs the imaging occurring angle.
  • the imaging is to be formed in a sawtooth-controlled imaging mode on the surface of the printing plate.
  • Gravure printing and letterpress printing have long been established printing techniques, with gravure printing in particular being used to produce higher value printed products around the world.
  • the intaglio technique as such is thus well known to the art in every detail, so that is discussed here in relation to the structure of a pressure roller used in gravure printing only insofar as this is necessary for understanding the invention described herein.
  • a mechanically operated stylus may vary depending on the dimensions of the actual cutting tool of the stylus, i. depending on the dimensions and the cut of a diamond, only produce a cup which is rigidly coupled to the depth of the cup in view of the expansion of the cup in the region of the surface of the printing plate. The deeper the cup is desired, the wider in the plane of the surface of the printing forme the opening of the cup and vice versa.
  • the mechanical engraving described above has some disadvantages, which are immediately recognizable from the above. Due to the indissoluble coupling of the depth to the width of a cup and vice versa, a further improvement in the quality of a print in border areas during the transition from one color to another color, for example. In multi-color printing, but also the contrast between light and dark (light, halftone, black) are only insufficiently influenced since the volume and volume of ink transfer and ink transfer of the well are always associated with the volume of the mechanically generated wells.
  • the laser engraving has the disadvantage that the printed products, which are produced by means of a laser engraved imprint roller, due to the RasterBFs or raster method used in both imaging methods, ie the arrangement of the individual halftone dots or wells to each other when overprinting, for example of four primary colors for the execution of a four-color printing process, ie in the finished printing, show interference, the so-called Moiré, which disturb the image impression significantly can and are therefore only partially suitable for the production of high-value printed products.
  • the actual cause of the formation of moire is the rigid imaging technique with electromechanical pricks, since the electromechanical pricks can move in the imaging only on the surface of the printing form, while the pressure roller performs a rotational movement about the roller axis, i. the cup is generated in the circumferential direction by machining the surface by means of the diamond in the direction of rotation.
  • the direction of the grid of all halftone dots is always 90 ° to the direction of the axis of the platen, or, if you like, parallel, i. 0 °, to the direction of rotation of the pressure roller.
  • This screening technique is also used in laser engraving analogous to electromechanical engraving, i. Also, the cells produced by laser light are aligned with respect to their screening parallel to the direction of rotation or at a right angle to the axis of rotation of the printing plate.
  • the screen angle ⁇ can also be selected differently as a function of the imaging information as such, since the imaging information as such also enters into the moiré formation probability.
  • the shape of the grid can also be selected as a function of the imaging information, depending on the different wells or partial cells to be formed within a grid cell, and depending on the tonal gradations of the grid points or partial grid points (black, halftone, light) within a grid cell.
  • the shape of the grid may preferably be a square and / or a rectangle and / or a parallelogram, wherein it is also possible to form the grid advantageously as a hexagon.
  • the halftone dots are at least partially carried out in a Be pileungsvorgang a printing form on predetermined surfaces of the printing plate according to the method of AM screening and other predetermined surfaces of the printing plate by the method of FM screening.
  • the printing technology experts is the training of Amplitudenmodulationsrastêt, short AM screening, one speaks of conventional screening, known, as well as the screening by the method of frequency modulation, short FM screening.
  • AM screening and FM screening are by no means mutually exclusive, since both methods have certain advantages over the particular screening for the particular reproduction of image information.
  • the energy of the laser light at the location of the impact of the laser light on the surface material of the printing form is a very important parameter for the formation of the well edges in the surface of the printing plate, the well depth and also the clear opening of the wells in the surface of the printing plate in which the wells be formed.
  • a raster point can be formed by means of the laser light from a plurality of individual sub-wells or individual partial raster points, but a raster point can also be generated by a single application of laser light. This depends on the selected energy of the laser light, on the focusing of the laser light on the surface of the printing form and ultimately on the time in which the laser light acts on the surface to form a cup.
  • the imaging of the printing form for forming the grid points of the grid cells is carried out in a process basic form with the same energy of the laser light per grid point or partial grid point.
  • the screen dots or cups thus formed thus regularly have the same cup diameter and the same cup depth, provided that the time that the laser light acts on the surface of the printing plate is always the same.
  • the method may preferably be modified in that the imaging of the printing form for forming the grid points of the grid cells with different Energy of the grid light per grid point or partial grid point is performed.
  • a grid cell a plurality of different depths and / or different opening diameter, ie different widths grid points or wells are generated, ie, to remain in one example, in the edge region of a grid cell wells are designed with small opening diameter, the but still have a sufficient depth for receiving and dispensing the ink, whereas, for example, the other areas of a grid cell screen dots or wells with a large well diameter with suitably large Druckfarbage- or Druckmaschineabgabekapaztician have.
  • the total number of halftone dots or cells that can be formed per screen cell thus allows a much better detail reproduction or a detail contouring of the finished printed image than previous methods make possible.
  • FM screening frequency-modulated screening
  • the majority in the sense described above also means that the laser beam in the majority of the passages for forming the final desired shape of the screen dot or of the cup in the course of the passages is not always strictly directed to the same imaginary point of the screen dot or the cup but in the manner of a mechanical clearing, starting from an imaginary center of the cup, is directed to the adjacent sides offset to the cup or the grid point, so that this thereby reaches its final opening width, which is predetermined by the Be
  • the laser light-exposure time interval can be set and preselected and is predetermined by the corresponding imaging parameters.
  • the laser light energy which is preferably adjustable and preselected, which is also chosen depending on the material of the surface of the printing plate, and wherein the energy of the laser light at the location of the application of the printing plate, i. on the surface, in turn, is tuned to the material of the printing form.
  • the method presented here is to keep a post-processing of the printing form as small as possible after the execution of the imaging.
  • a ridge of the material of the printing plate is formed after formation of the respective cup in the edge region of each cup, said Burr by a Entgratungsvorides, which acts like a scraper is removed.
  • a halftone dot or a partial grid point is first generated by means of low energy of the laser light, that the formed halftone dot or formed partial grid point is subsequently subjected to a maximum energy of the laser light and that subsequently Finally, the formed halftone dot or the formed partial grid point is in turn subjected to lower energy of the laser light.
  • the advantage of this procedure is that first the material in the first process step is heated to just below the evaporation temperature of the material of the printing forme, i. suitable temperature is controlled, that subsequently upon the application of the halftone dot with high energy, the evaporation is gently introduced and carried out without causing warping in the edge region of the grid point or the cup, and that in turn with lower energy of the grid point or the well is applied, wherein in the last process step, no evaporation of the material takes place, but the environment is maintained at a temperature such that no condensation of the vaporized material in the region of the edge of the opening of the grid point or of the well can take place, but, as far as necessary, can be sucked off and finally the material can cool gently. Small residues of the material in the vicinity of the opening of the grid points or the wells can then be easily removed with a scraper.
  • Fig. 1 In the conventional imaging of printing plates 14, which are used for gravure printing (with certain restrictions also in principle for the high pressure) the imaging of the printing forme 14 takes place by means of laser light 18, cf. also the Fig. 8 and 10 in that, in accordance with the image information, halftone dots 10 or cells or partial cells are produced, corresponding to the respective tonal values of the image or imaging information between 100% (black) and 0% (light) and the tones (semitones) between them ,
  • FIG. 1 a This is schematic in Fig. 1 a. shown.
  • the Fig. 1 b. and 1 c. schematically represent the screening method according to the method of frequency modulation, also called FM screening for short, which is derived from the AM screening method.
  • Fig. 1 a. differs in that a grid point 10 gem. a tone value in a plurality of grid points 10 is divided and distributed over the grid cell 11.
  • the distribution of the individual halftone dots 10 gem. the respective tonal values to be displayed in a grid cell 11 is between the Fig. 1 b. and 1 c. differently.
  • the arrangement of the individual grid points 10 in Fig. 1 b. is symmetrical according to the desired tone value per grid cell 11, whereas the arrangement of the grid points 10 gem.
  • Fig. 1 c. assumes a stochastic distribution of the grid points 10.
  • the stochastic distribution of the halftone dots 10 acc. Fig. 1 c. leads according to the symmetrical distribution of the grid points 10 gem.
  • the main reference axis is not necessarily in the Fig. 1 a. to 1 c. horizontal axis must determine the grid 12, but it would also be possible in the Fig. 1 a. to 1 c. shown vertical axis as a reference axis, ie grid axis 120 to determine.
  • the horizontal axis of the grid 12 is the reference axis.
  • the Fig. 2 to 4 show the basic scheme of the invention. It can be seen that the grid 12 at an acute angle ⁇ relative to the rotational or linear movement of the printing plate 14 and the corresponding complement angle ⁇ relative to the axis of rotation 15 of the printing plate 14 in the generation of the halftone dots 10, in the Fig. 2 to 4 not shown, is rotated. The rotation is symbolized by the arrow 16, which shows the direction of rotation of the grid 12.
  • a grid 12 is shown, in which the individual grid cells 11 consist of hexagonal cells in the manner of a honeycomb. Ultimately, however, all suitable cell structures are conceivable.
  • a grid cell 11 is shown, in which a plurality of grid points 10 and wells are formed, in which case the grid points all have the same opening size.
  • each a grid cell 11 in the Fig. 6 and 7 From the representations of each a grid cell 11 in the Fig. 6 and 7 can be seen that there formed a plurality of halftone dots 10 per grid cell 11 is formed and in the respective edge regions of the grid cell 11 formed grid points 10 have a smaller opening diameter than the grid points located at the respective center of the grid cell 11 10th
  • the raster angle can be selected as a function of the information which forms the basis of the imaging of the printing form 14 in the form of raster dots or cells 10, which incidentally also applies to the form of the grid 12 itself applies.
  • the halftone dots 10 or wells can have different cross sections under the premise of the best possible ink absorption behavior and the best possible color rendering behavior, or they can be produced in different ways by means of laser light.
  • special cross-sectional shapes can be selected.
  • a solid (black) is generated, for example, by the fully engraved cup 100, whereas halftones can be generated, for example, by a screen dot or a cup 102, which, for example, have a central elevation, s. Cup 102.
  • the cup shape 101 in the form of a cap 101 when the geometric depth of the cup or the grid point 10 is low, well suited to achieve a good area coverage during printing. It should be noted that the representation of the geometric depth of the grid point 10 in Fig. 9 Here is greatly exaggerated to clearly represent the different cross-sectional shapes of the grid points 10 and wells can.
  • a single grid point 10 or a finished grid point 100, cf. again, too Fig. 9 Can be formed from a plurality of individual halftone dots 10 and sub-grid points.
  • the laser light 18, which is controlled in accordance with the Betradeungsun is directed per grid point 10 on the surface of the printing plate 14 and in dependence on the time of exposure of the laser light and in dependence on the energy with which the laser beam 18 on the surface 17th the printing forme 14 acts, differently sized raster dots 10 with respect to the opening width and the geometric depth of the raster point 10 in the material of the printing forme 14 are generated.
  • an arbitrarily large opening of the raster point 10 or any geometric depth of the raster point 10 can be achieved, wherein the envelope 19 ultimately determines the shape of the finished cell 100, cf. again Fig. 9 ,
  • Adjacent grid cells 11 but also respective adjacent grid points 10 themselves form between them a web 22 which is of great importance for a sharp contouring of the finished printed product and also for the color behavior of the individual colors in multicolor printing when imaging a printing form 14 for gravure printing.
  • a high-precision adjustment of both adjoining screen dots 10 can be achieved.
  • the formation of a narrow web 20, dashed line, by laser light high energy density is possible, especially the two Randraster10.
  • a wide web 21, solid line with low energy density the laser light 18 can be generated to form the two adjacent screen dots 10.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (20)

  1. Procédé destiné à graver une forme d'impression, en particulier à graver une forme d'impression pour l'impression en héliogravure, dans lequel les alvéoles de captation d'encre et de restitution d'encre, à graver sur la forme d'impression selon une trame prédéterminée, correspondant dans leur totalité aux informations prédéterminées de formation d'image par forme d'impression, sont générées à l'aide d'une lumière laser, et la trame étant inclinée sous un angle α aigu par rapport au déplacement en rotation ou linéaire de la forme d'impression lors de la génération des points de trame et une cellule tramée étant formée par une pluralité de points de trame, et dans lequel, chaque fois, une pluralité d'alvéoles de trame étant réalisées dans les cellules de trame.
  2. Procédé selon la revendication 1, caractérisé en ce que l'angle de trame α est susceptible d'être choisi en fonction des informations de formation d'image.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la forme de la trame est susceptible d'être choisie en fonction des informations de formation d'image.
  4. Procédé selon la revendication 3, caractérisé en ce que la forme de la trame est un carré ou un rectangle.
  5. Procédé selon la revendication 3, caractérisé en ce que la forme de la trame est un hexagone.
  6. Procédé selon la revendication 3, caractérisé en ce que la forme de la trame est une ligne.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que, lors d'un processus de formation d'image sur une forme d'impression, les points de trame sont réalisés, sur des surfaces prédéterminées de la forme d'impression, au moins partiellement selon la méthode du tramage AM et, sur d'autres surfaces prédéterminées de la forme d'impression, au moins partiellement selon la méthode du tramage FM.
  8. Procédé selon la revendication 7, caractérisé en ce que, lors d'un processus de formation d'image sur une forme d'impression, au moins une surface prédéterminée de la forme d'impression est munie de l'image tant selon la méthode de tramage AM qu'également selon la méthode de tramage FM.
  9. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce qu'une teinte homogène d'un point de trame est obtenue avec une valeur de ton de 100 à 80 % au moyen du tramage AM.
  10. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce qu'une teinte d'un point de trame ayant une valeur de ton de 80 à 40 % est obtenue tant au moyen d'un tramage AM qu'également au moyen d'un tramage FM.
  11. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce qu'une teinte d'un point de trame ayant une valeur de ton de 40 à 0 % est obtenue au moyen du tramage FM.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que, dans une cellule de trame, une pluralité de points de trame de grosseur différente sont réalisés lors du processus de formation d'image.
  13. Procédé selon la revendication 12, caractérisé en ce que les points de trame situés aux bords de la cellule de trame sont plus petits quel les points de trame situés au centre de la cellule de trame.
  14. Procédé selon l'une des revendications 1 à 13, caractérisé en ce que la formation d'image sur la forme d'impression pour réaliser les points de trame des cellules de trame est réalisée avec la même énergie de lumière laser par point de trame ou point de trame partiel.
  15. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que la formation de l'image sur la forme d'impression pour réaliser les points de trame des cellules de trame est réalisée avec une énergie différente de lumière laser par point de trame ou point de trame partiel.
  16. Procédé selon la revendication 15, caractérisé en ce que les points de trame ou points de trame partiels aux bords des cellules de trame sont générés avec une plus faible énergie de lumière laser que les points de trame ou points de trame partiels générés au centre des cellules de trame.
  17. Procédé selon l'une des revendications 1 à 16, caractérisé en ce qu'un point de trame ou un point de trame partiel est généré au moyen d'une pluralité d'intervalles de temps de sollicitation par une lumière laser.
  18. Procédé selon la revendication 17, caractérisé en ce que les intervalles de temps de sollicitation par une lumière laser sont réglables et présélectionnables.
  19. Procédé selon l'une des revendications 17 ou 18, caractérisé en ce que l'énergie de lumière laser est réglable et présélectionnable.
  20. Procédé selon l'une des revendications 17 à 19, caractérisé en ce qu'un point de trame ou un point de trame partiel est généré d'abord au moyen d'une faible énergie de la lumière laser, en ce que le point de trame formé ou le point de trame partiel formé est ensuite sollicité avec une énergie maximale de la lumière laser, et en ce que, ensuite, le point de trame formé ou le point de trame partiel formé est de nouveau sollicité avec une faible énergie de la lumière laser.
EP07011124A 2007-06-06 2007-06-06 Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser Revoked EP2001218B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE502007005952T DE502007005952D1 (de) 2007-06-06 2007-06-06 Verfahren zum Gravieren einer Druckform mittels Laserlicht
AT07011124T ATE492117T1 (de) 2007-06-06 2007-06-06 Verfahren zum gravieren einer druckform mittels laserlicht
EP07011124A EP2001218B1 (fr) 2007-06-06 2007-06-06 Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07011124A EP2001218B1 (fr) 2007-06-06 2007-06-06 Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser

Publications (2)

Publication Number Publication Date
EP2001218A1 EP2001218A1 (fr) 2008-12-10
EP2001218B1 true EP2001218B1 (fr) 2010-12-15

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EP07011124A Revoked EP2001218B1 (fr) 2007-06-06 2007-06-06 Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser

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EP (1) EP2001218B1 (fr)
AT (1) ATE492117T1 (fr)
DE (1) DE502007005952D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8462391B2 (en) * 2009-03-13 2013-06-11 Heidelberger Druckmaschinen Ag Method for producing a pseudo-stochastic master surface, master surface, method for producing a cylinder cover, cylinder cover, machine processing printing material, method for producing printed products and method for microstamping printing products
EP2305464A1 (fr) * 2009-09-30 2011-04-06 Ernst-Rudolf Dr. Weidlich Procédé de gravure d'une surface, une surface d'un moule d'impression pour l'impression en profondeur et une surface réalisée selon ce procédé
NL2023203B1 (en) * 2019-05-27 2020-12-02 Spgprints B V Screen printing, in particular rotary screen printing of textile materials

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131782A (en) 1976-05-03 1978-12-26 Lasag Ag Method of and apparatus for machining large numbers of holes of precisely controlled size by coherent radiation
DE2827596C2 (de) * 1978-06-23 1984-11-22 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Verfahren und Anordnung zur Herstellung gerasterter Druckformen
US5143578A (en) * 1990-08-07 1992-09-01 Union Carbide Coatings Service Technology Corporation Method for engraving solid articles with laser beams
JP2759186B2 (ja) * 1992-10-21 1998-05-28 大日本スクリーン製造株式会社 多色網目版画像作成方法
US7268920B1 (en) * 1999-03-16 2007-09-11 Megadot Systems Limited Halftone patterns
JP4121256B2 (ja) * 2001-06-12 2008-07-23 富士フイルム株式会社 網点閾値データ作成方法

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DE502007005952D1 (de) 2011-01-27
EP2001218A1 (fr) 2008-12-10
ATE492117T1 (de) 2011-01-15

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